diff --git a/tools/virtio/vringh_test.c b/tools/virtio/vringh_test.c
index 13e0a769623d6988e55579dcef3eaa62c98117b9..51d922fd4f62ce1edbb6b1af87ce56aaf2a7a3f1 100644
--- a/tools/virtio/vringh_test.c
+++ b/tools/virtio/vringh_test.c
@@ -132,7 +132,7 @@ static inline int vringh_get_head(struct vringh *vrh, u16 *head)
 	return 1;
 }
 
-static int parallel_test(unsigned long features,
+static int parallel_test(u64 features,
 			 bool (*getrange)(struct vringh *vrh,
 					  u64 addr, struct vringh_range *r),
 			 bool fast_vringh)